4 Answers
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In general, I would say it's not good as a CAD tool for mechanical engineering.

It's good for modeling good looking things (teaspot, tree, people etc.), but if you want to for example handle strength calculations, you are basically out of luck (unless you do everything manually).

Of course, if you have to sell something, and you need good-looking renderings, then Blender might be good tool, but that's different from designing machines or buildings from engineering point of view.

Tools like Blender work differently than most engineering CAD software. Blender-like apps are focused on manipulating the textures, colors, and other attributes of surfaces. However, those apps lack the ability to easily specify specific dimensions that you need to manufacture a part, as well as the ability to generate engineering drawings a machinist needs.